Fantasy (maybe YA). Boy is given a necklace that is a box with something inside. A tree catches fire. Boy later lives with a very tall man, goes to boarding school, kids find secret room w/ giant boat in it. Later fight a giant snake at abandoned fortress.

[Darla]

My son read this book in 2021 or 2022, when he was 10 or 11 (he is an advanced reader, though, and could have read a YA book or adult reading level.) Book began with a boy and friends on a small bridge when a man on horseback came, and the boy either jumped or fell off the bridge. Thanks in advance for your help!

[Morgan]

Darla wrote: "My son read this book in 2021 or 2022, when he was 10 or 11 (he is an advanced reader, though, and could have read a YA book or adult reading level.) Book began with a boy and friends on a small br..."

It sounds like the Red Pyramid by Rick Riordan

[Capn]

Morgan wrote: "Darla wrote: "My son read this book in 2021 or 2022, when he was 10 or 11 (he is an advanced reader, though, and could have read a YA book or adult reading level.) Book began with a boy and friends..."
The Red Pyramid for Morgan's trackable :)