The End of the Rainbow — Donna Baker

A historical romance set in London in the 1860s. Megan desperately needs to trace her grandmother, as the lives of her family in Wales depend on her. Her only hope is that Tom can help, however she and Tom have had a big quarrel. But now she needs him more than ever.

"Lambeth, London, 1861. Dear Tom, I'm so sorry we quarrelled. How I wish I hadn't left without telling you. Please understand, I have to find Grandmother. The lives of my family in Wales depend on her. Oh Tom, I think I'm in terrible trouble. I'm so afraid and I need you more than ever. I pray I will see you again. Megan."