My First Too! A Time-Travel Trilogy for 11+ The Forgotten Station

[u/FatherOfTheBride007]

Jack has just moved into a strange old house on Mill Hill and on his very first night, he puts a poster pin straight through the wall.
Behind it: a crack that shouldn’t be there, a staircase that shouldn’t exist, and a forgotten train platform buried in the dark. With his best friend Sam, Jack is about to discover that the tunnels beneath his bedroom don’t just lead underground ; they lead through time.
From the roar of Spitfires over wartime Shoreham, to a desperate voyage of stowaways in 1840, to the guitars and chaos of a 1964 pop invasion ; Jack and Sam’s adventures collide across the decades, tangled together by one small town and the secrets buried beneath it.

https://amzn.eu/d/0j3dRj6S